Well, of course I prefer a different method:
https://www.mccowntech.com/product/outdoor-gige-ethernet-poe-injector/

From: Christopher Gray 
Sent: Monday, January 22, 2018 8:28 AM
To: af@afmug.com 
Subject: Re: [AFMUG] Use Unpowered PoE Injector on Long Ethernet Runs?

That cable is not shielded (so the shields would not be connected). 

The Gigabit PoE that comes with Cambium ePMP hardware has a full set of 
magnetics (all pairs). 


--------------------------------------------------------------------------------


On Mon, Jan 22, 2018 at 10:23 AM, Chuck McCown <ch...@wbmfg.com> wrote:

  Is the cable shielded?

  From: Christopher Gray 
  Sent: Monday, January 22, 2018 8:17 AM
  To: af@afmug.com 
  Subject: [AFMUG] Use Unpowered PoE Injector on Long Ethernet Runs?

  I have a customer with bizarre issues. I've replaced almost everything but 
odd issues keep coming back.  

  The customer has a 100' run of Ethernet cable from the house to the barn, and 
a switch in the barn. I'm wondering if there might be an issue with different 
power sources, possibly different grounds between the router and the switch. 
The issues are intermittent enough that I can't ask for them to just disconnect 
their barn as it is used for work.

  If I install an unpowered gigabit PoE injector in-line with that 100' run, 
will that eliminate any issues with different power or different grounds 
between different buildings since the buildings would be on separate sides of 
the magnetics, or do I need better separation? 


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